Frontline is not an immediate kill type of product. Is there any flea dirt (small black pieces of flea feces) on your dog? It is possible she picked up a couple of fleas when she went out to urinate/defecate. Also, the makers of Frontline suggest treating the animals (all animals in the house) for 3 consecutive months in order to eliminate a flea problem.
If you notice flea dirt on her then I would suggest contacting your vet about a product like trifexis, comfortis or nexgard.
Hi Dale,
I’m not a vet, just lifelong experience with a variety of animals, but until a vet see’s your post I’ll chime in. . Prior to giving your dog any supplements or other pills you should consult your vet to determine if the supplement is needed or not. Sometimes an underlying condition could be the cause of your pets problem. At 15yrs old, that’s pretty senior for a lab and I’d be thinking at this point your pet may need a heavier type of medication to help with the stiffness and pain involved with getting up.
Looking forward to what vet’s reply.
Good luck!
~kelly